Dhw Configuration Parameters - Ace Heating Solutions Atlas A050 Operating And Maintenance Manual

Maximum off point

4-20 DHW Configuration Parameters

Table 4.7 displays Domestic Hot Water (DHW) configuration parameters.
Refer to 5-3 DOMESTIC HOT WATER RELATED CONFIGURATION for Domestic Hot Water (DHW) parameter
programming.
Parameter
DHW enable
DHW demand Switch
Priority method
Modulation sensor
DHW setpoint
DHW time of day setpoint
DHW off hysteresis
DHW on hysteresis
DHW priority override time
DHW hysteresis step time
DHW priority source
DHW priority vs LL
DHW P-gain
DHW I-gain
DHW D-gain
32 °F to 240 °F (0 °C to 115 °C)
Table 4.6 – Outdoor Reset Configuration Parameters
Disable or Enable Domestic Hot Water Loop
Modulation sensor only: no other input is considered
and pump demand is derived from burner demand
DHW switch: a switch replaces the DHW sensor, DHW
sensor in a shorted condition indicates pump demand,
and this condition also must be present for burner
demand to exist; Outlet Sensor is chosen then the outlet
sensor will provide the control temperature.
STAT terminal: the STAT input in the On condition
creates pump demand and it also must be on for burner
demand to exist; if it is off there is no demand.
Auto DHW or sensor only: When DHW is open then use
it as heat demand, and use modulation sensor selection
for operation. Otherwise if DHW is providing a
temperature, use it for heat demand and as the sensor for
operation.
Boost during priority time
DHW (S6S7) sensor: DHW loop operating sensor is the
DHW sensor.
Outlet (S3S4) sensor: DHW loop operating sensor is the
Outlet sensor.
Inlet (S1) sensor: DHW loop operating sensor is the Inlet
sensor.
Auto DHW (S6) of Inlet (S1): If the DHW demand switch
is configured for auto, and if it detects that the DHW
sensor is open or shorted then use the Inlet sensor for
modulation.
Auto DHW (S6) of Outlet (S1): If the DHW demand
switch is configured for auto, and if it detects that the
DHW sensor is open or shorted then use the Outlet
sensor for modulation.
Setpoint for normal DHW modulation
32 °F to 240 °F (0 °C to 115 °C)
This setpoint is used whenever the time-of-day switch is
off or not connected
Setpoint when Time Of Day switch is on
32 °F to 240 °F (0 °C to 115 °C)
This setpoint is used when the time-of-day switch is on
Differential above setpoint when boiler is turned off
2 °F to 30 °F (1 °C to 16 °C)
Differential from setpoint when boiler is turned on.
2 °F to 30 °F (1 °C to 16 °C)
No DHW priority time (0), or
DHW priority time
Time between hysteresis step changes
(0=Disable hysteresis stepping)
System priority
CH > DHW
DHW > CH
System priority
LL > DHW
DHW > LL
Proportional term of PID
0-400
Integral term of PID
0-400
Differential term of PID
0-400
Comment
56
None
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Rev 2.1